Synthesis and properties of deltic acid (dihydroxycyclopropenone) and the deltate ion
作者:David Eggerding、Robert West
DOI:10.1021/ja00428a043
日期:1976.6
Delticacid (dihydroxycyclopropenone, 5) has been prepared by reaction of 1-butanol and bis(trimethylsiloxy)cyclo- propenone (9), which was obtained by photoiytic decarbonylation of bis(trimethylsiloxy)cyclobutenedione. Dilithium deltate (lb) has also been synthesized from 9 and lithium rerf-butoxide. The structure of 5 was established by its conversion to di- methoxycyclopropenone, and lb was identified
SERRATOSA, F., ACCOUNTS CHEM. RES., 1983, 16, N 5, 170-176
作者:SERRATOSA, F.
DOI:——
日期:——
Molecular structure and infrared spectra of 3,4-dihydroxy-3-cyclobutene-1,2-dione; experimental matrix isolation and theoretical Hartree-Fock and post Hartree-Fock study
作者:Hanna Rostkowska、Maciej J. Nowak、Leszek Lapinski、Dayle Smith、Ludwik Adamowicz
DOI:10.1016/s1386-1425(97)00030-9
日期:1997.7
The infrared spectra of 3,4-dihydroxy-3-cyclobutene-1,2-dione (squaric acid) isolated in low-temperature Ar and N-2 matrices are reported. The comparison of the experimental spectra with those theoretically calculated at HF/6-31 + + G**, MP2/6-31G** and DFT(B3-LYP)/6-31++G** levels shows that the molecules of the compound isolated in low-temperature matrix adopt the structure with C-2v symmetry. This structure is different from the one which was found in the crystal. Theoretical calculations of relative energies of C-2v and C-s structures predict the C-2v conformation to be lower in energy by 8 kJ mol(-1). Good agreement between the experimental and theoretical spectra allowed for a reliable assignment of the observed IR absorption bands. (C) 1997 Elsevier Science B.V.